Granted Patent
Utility
US 5,614,473 · App. 08/446,393
Use of high purity imidazoline based amphoacetate surfactant as foaming agent in oil wells
Inventors:
David Dino, Anthony Homack
Patented Case
View Patent ↗
Granted: Mar 25, 1997
Filed: May 22, 1995
Inventors
David Dino
Anthony Homack
Assignee (at issue)
Rhone-Poulenc, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.